There are a few reasons for this. One is the obvious one, which is because everyone's schedule is out of whack thanks to the COVID-19 coronavirus. And of course, it's not exactly like Microsoft was coming ahead of schedule before this happened. From what I've heard previously, Windows 10X was running behind before all of this happened anyway, although I hadn't heard anything about a delay until next year.

The other, and perhaps more interesting reason is that Windows 10X might actually ship for single-screen devices like clamshells and convertibles first. While it's not surprising that Windows 10X is coming to more traditional devices, but it's more surprising that it might come to single-screen PCs first. After all, the OS is designed for dual-screen PCs.

There are a lot of interesting features in Windows 10X, and they don't all have to do with dual screens. Many of the shell changes would be welcome by many in a Windows 10 tablet UI, and all of the apps are containerized, a feature that could well make its way into Windows 10 at some point.